Messages in this thread | | | Date | Fri, 27 Aug 2010 14:48:02 +0100 | From | Hedi Berriche <> | Subject | Re: Serious problem with ticket spinlocks on ia64 |
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On Fri, Aug 27, 2010 at 14:38 Petr Tesarik wrote: | Hi everybody, | | SGI has recently experienced failures with the new ticket spinlock | implementation. Hedi Berriche sent me a simple test case that can | trigger the failure on the siglock.
One more fact, the problem was introduced by commit
commit 9d40ee200a527ce08ab8c793ba8ae3e242edbb0e Author: Tony Luck <tony.luck@intel.com> Date: Wed Oct 7 10:54:19 2009 -0700
[IA64] Squeeze ticket locks back into 4 bytes.
Reverting the patch makes the problem go away.
IOW, and as far as testing shows, the first incarnation of the ticket locks implementation on IA64 (commit 2c8696), the one that used 8 bytes, does not exhibit this problem.
Cheers, Hedi. -- Hedi Berriche Global Product Support http://www.sgi.com/support
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